<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="/js/vue.js"></script>
</head>
<style>
    #app{
        width: 600px;
        margin: 40px auto;
    }
    .outer{
        display: flex;
        margin-bottom: 20px;
    }
    .inner{
        padding: 0 10px;
        text-align: center;
        min-width: 100px;
        border-bottom: 1px solid #000;
        font-weight: bold;
        color: red;
    }
</style>
<body>
    <div id ="app">
       <div class="outer">今天天气不错，我准备
        <div class="inner">{{activity}}</div>
       </div>
       <advice @advice="receiveAdvice"></advice>
    </div>
    <script>
        Vue.component('advice',{
            data(){
                return{
                    arr:['打篮球','野炊','游泳','宅在家','复习迎考']
                }
            },
            template:'<button @click="giveAdvice">给出建议</button>',
            methods:{
                giveAdvice:function(){
                    let msg =this.arr[Math.floor(Math.random()*this.arr.length)]
                    this.$emit('advice',msg)
                }
            }
        })
       let app =new Vue({
         el:"#app",
         data:{
           activity:''
         },
         methods:{
            receiveAdvice(msg){
                this.activity=msg
            }
         }
       })
    </script>  
</body>
</html>